After searching the net, I found out, that although the MacBook white Unibody 2009 and the MacBook Pro 13' share the same internals, Apple allowed the Sierra Update for the MacBook, but not for the MacBook Pro. That is where I am stuck now. I have El Capitan running, but I want to revert to the original firmware as I'd like to update to High. MacBook Pro models running Mac OS X 10.7 'Lion' or Mac OS X 10.8 'Mountain Lion' -- whether pre-installed or otherwise -- are not capable of running Mac Apple provides no support for running Mac OS 9 or the 'Classic Environment' on Intel-based Macs like the 'Unibody' MacBook Pro models.

Also after handling and working with the test sample for a longer time excellent the first impression persists. Design, haptics, and stability are top. The new Aluminium MacBook is the eagerly awaited successor of the 12' Powerbook. Its design follows the design of the bigger MacBook Pro and the top models of the Apple MacBook series create a new quality category. Actually the Aluminium MacBook is rather a 13.3' MacBook Pro. The design is based on the MacBook Air's and sets standards in design and workmanship.

Especially the rounded display lid reminds very much on the MacBook Air. Also the power button and the keyboard are the same. The only contrasts to the aluminium case are the black bordered display (with glass pane in front of it) and the black plastic cover of the hinge (in order to guarantee WLAN and Bluetooth reception). The full-body aluminium case has an excellent haptics and appears to be of very high quality. The display lid was improved and closes absolutely flush (a point of critique of the former MacBook Pro model), because it utilizes the same closing mechanism which was new in the MacBook Air. The magnetic lock works excellent and holds the display sufficiently tight if closed.

Also the gaps between the parts are precise and even. Only the look of the 'old' Magsafe socket (I know like in former times) does not match the new look of this Apple laptop. Summarizing the above, the MacBook was clearly improved by the new design and the new production process, which uses only one aluminium block and is therewith clearly better than the already good predecessor model (in black and white). Source: Case.

Also the connectivity still appears to be meagre. Especially the mini DisplayPort stood out in a negative way, becaus an adapter is missing. Apple could have at least provided an adapter for VGA and DVI. Only two USB ports are also often too few. As so far Apple locates all interfaces on the left side of the case.

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Apple further reduced the already rather low number of interfaces of the black and white plastic MacBooks. It's in vain to look for a FireWire port on the new model. Compared to the MacBook Pro also an ExpressCard slot is missing. The new mini DisplayPort replaces the mini DVI port of the former model and is due to the a higher maximum resolution of 2560x1600 cleary advantageous. However, you also need to add further costs for a display adapter (VGA, Video, DVI), because Apple does not provide any.